Why would App Store Connect say "Newer Build Available" when there isn't?

Question

I made a new build of my app (version 2.2 build 11) and uploaded to App Store Connect.

Then I used "(+) Version or platform" to prepare version 2.2 for submission. When I press "Submit for Review", I get a warning:

Newer Build Available

Are you sure you want to submit this build for review? A newer build of your app is available. To submit the newer build, delete this earlier build and resubmit.

The currently released version of the app is 2.1. The "Activity" tab of App Store Connect only shows this build (11) for version 2.2. Build 10 was version 2.1.

What does this error actually mean, and how am I meant to resolve it? The obvious thing is to try deleting this build and resubmitting it, but I'd like to understand more about the error, especially if it turns out deleting and resubmitting doesn't help (haven't tried yet).

Answer 1

Solved it.

As an infrequent iOS developer, I thought that specifying the version number after hitting "(+) Version or platform" would be enough. But I missed actually choosing the build far down in the submission form.

Presumably it defaults to the previously submitted build, which in this case would be 2.1 build 10, causing the error.

So the error message could have been better, but it was ultimately something I missed.